Mark Rees
CTO
Century Software
What is Computer Vision – 1980’s
Then it was called Machine Vision
"the automatic acquisition and analysis of images to obtain desired data for interpreting
a scene or controlling an activity" (Schaffer, 1984).
cnt dw $0000
src dw $0000dst dw $0000
memcpy publicldab cnt+1 ;Set B = cnt.Lbeq check ;If cnt.L=0, goto check
loop ldx src ;Set IX = srcldaa ix ;Load A from (src)inx ;Set src = src+1stx srcldx dst ;Set IX = dststaa ix ;Store A to (dst)inx ;Set dst = dst+1stx dstdecb ;Decr Bbne loop ;Repeat the loopstab cnt+1 ;Set cnt.L = 0
check tst cnt+0 ;If cnt.H=0,beq done ;Then quitdec cnt+0 ;Decr cnt.Hdecb ;Decr Bbra loop ;Repeat the loop
done rts ;Return
What is Computer Vision - 2014
“Computer vision is a field that includes methods for acquiring, processing, analyzing, and understanding images and, in general, high-dimensional data from the real world in order to produce numerical or symbolic information, e.g., in the forms of decisions. A theme in the development of this field has been to duplicate the abilities of human vision by electronically perceiving and understanding an image. This image understanding can be seen as the disentangling of symbolic information from image data using models constructed with the aid of geometry, physics, statistics, and learning theory. Computer vision has also been described as the enterprise of automating and integrating a wide range of processes and representations for vision perception.” (Wikipedia 2014 http://en.wikipedia.org/wiki/Computer_Vision)
What is Computer Vision - 2014
Computer Vision – My Reality
CV is a lot more than grabbing an image
CV
Object IlluminationImage
Capture
Sensors/Cameras Digitisation/Conversion
Image
Processing
Algorithm
DevelopmentImplementation
Display Control
Python Imaging Library
Pillow – The friendly PIL fork python 2.6+, 3.2+http://python-pillow.github.io/
PIL – The “original” PIL python 1.52+, 2.0+ last release 11/2009 http://effbot.org/downloads
Demo: PIL.ipynb
Scipy ndimage
N dimensional array image processing
http://docs.scipy.org/doc/scipy/reference/ndimage.html
Demo: Multi-demensional image processing.ipynb
SimpleCV
SimpleCV is an open source framework for building computer vision applications. With it, you get access to several high-powered computer vision libraries such as OpenCV – without having to first learn about bit depths, file formats, color spaces, buffer management, eigenvalues, or matrix versus bitmap storage.
http://simplecv.org/
Demo: SimpleCV - The Basics.ipynb
Pygame dependency caused me some problemsNot all image manipulation worked in ipython. Simplecvshell is where all functionality works.
PyOpenCV
Official python wrapper for OpenCV C/C++ librariesTwo namespaces cv & cv2. Use cv2, cv deprecatedBasis of SimpleCV and other python CV libraries
Demo: OpenCV - The Basics.ipynb
Demo: OpenCV Motion Detection.ipynb
Demo: OpenCV Face Detection.ipynb
Raspberry Pi CV
OpenCV available but USB cameras slowRpi camera faster, uses GPU, doesn’t work with OpenCVapt-get install python-picamera solves that.http://picamera.readthedocs.org/en/release-1.5/
Resources
http://www.packtpub.com/opencv-computer-vision-with-python/book
http://programmingcomputervision.com/There also is a Python CV module PCV
http://szeliski.org/Book/Computer Vision: Algorithms and Applications
Mark [email protected]
+Mark Rees
@hexdump42
hex-dump.blogspot.com
https://bitbucket.org/hexdump42/seeing-in-python-pycon-sg-2014
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